SiW [1]} is another commonly used high-quality dataset with more identities. The collection is captured by two different quality devices: Canon EOS T6 and Logitech C920. Compared to Oulu-NPU, it includes more environment variations and spoof mediums. The numbers of fine-grained patch type classes during training in protocol 1, 2, 3-1, and 3-2 are 14, 8, 6, and 10, respectively. As shown in Tab. REF , our method performs the best for the first two protocols and achieves competitive results in protocol 3.
